In his Slapstick form, Harmon has virtually unlimited malleability. His strength, speed, stamina, agility, and reflexes are all at superhuman levels. His body is incredibly durable to the point that there is almost no way for him to be harmed beyond his ability to recover. His powers have been described as "all of the abilities of a Saturday morning cartoon character"

Abilities

Slapstick is a talented and inventive practical joker with a highly developed bizarre sense of humor.

Weapons

Slapstick uses a large blue mallet which he stores in the sub-space field linked to his gloves.

Paraphernalia

Possesses a pair of gloves which allow him to transform from his Slapstick form into his human form and back again. The gloves are also an access point to a sub-space aperture or pocket dimension where he can store objects. He can retrieve the objects from the spatial aperture by using a programmed gesture attuned to the particular object he is trying to select.

Has fought numerous bizarre villains and encountered a variety of superhumans including Spider-Man, Ghost Rider, Daredevil, the New Warriors, the Fantastic Four, Doctor Yesterday, the Overkiller, and the Neutron Bum. He has also developed a friendly rivalry with Speedball. He later joined the Initiative and beat his instructor,Gauntlet (Joseph Green) into a near-coma and painted NW (for New Warriors) on his shirt in his own blood. for cracking jokes about and insulting the New Warriors. Steven was placed in a prison with other initiative trainees and instructors who had ties with the New Warriors. However when Gauntlet woke up,he claimed it was an invisible Iron Man villain who beat him,and not anyone in the Initiative. Slapstick and the others were released from prison.